The Hayward Gallery's Light Show exhibition: Installations by more than 20 international artists

London's Hayward Gallery is hosting an exhibition of 25 light-based installations dating from the 1960s to the present day. The gallery at London's South Bank has gathered the collection of works which are said to be the first survey of "light-based art" in the UK, including some pieces which have not been seen for decades. Above, a woman admires a light installation by Carlos Cruz-Diez entitled 'Chromosaturation'.Picture: Oli Scarff/Getty Images